Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

public class Test { public static void main(String ar[]) { Integer a = 10; Integer b =10; Integer c = 145; Integer d = 145; System.out.println(a==b); System.out.println(c==d); } }

iGate,

7 13165

How to prevent to create multiple objects of a java class?

ASD Lab, TCS,

3 8995

What is OOPS Concept?

Cap Gemini,

1 4916

What is access modifiers?

Cap Gemini,

1 4337

Explain JSP life cycle

Cap Gemini,

1 4019

How do you implement polymorphism in our day to day life?

Cap Gemini,

3230

What is design pattern and there types?

Cap Gemini,

2 6471

What is aggregation?

Cap Gemini,

1 3959

solve this is my problem byte a=40,byte b=50 both add value is 90 this is with in range of byte... byte range is -128to 127.... why this pgm gives error like type mismatch.... package javapgms; public class byte1 { public static void main(String args[]) { byte a=40,b=50; byte c=a+b; System.out.println(c); } } note : dont use int k... a,b,c are in byte range... mind it..

2 6280

Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?

Ericsson,

5 8874

Why method overloading and method overriding required in java?

Ericsson, Wipro,

1 5063

In collection sorting comparable and comparator interface will be used..but why this two interfaces required..two will work same purpose so why there are two interfaces instead of one?when to use comparator and when to use comparable?

Ericsson,

1 4887

What is OOPs & Why?

3 5125

String is mutable or immutable?

3 6767

INTERVIEW QUESTION FOR ANDROID

2139

Post New Core Java Questions

Un-Answered Questions { Core Java }

What are the different types of data structures in java?

986

What is static import?

1158

What is the association?

978

Variable of the boolean type is automatically initialized as?

1005

Which class is the superclass for all the classes?

1019

What is the purpose of static keyword in java?

956

What is polymorphism in java? What are the kinds of polymorphism?

1067

What is array sorting in java?

1053

Can we clone singleton object?

1057

Explain the scope of a variable.

1093

Give me some null interfaces in java?

1052

Can a boolean be null java?

969

Implement 2 stacks with just 1 array. The stack routines must not indicate overflow unless every slot in array is used.

1308

Why destructor is not used in java?

970

Difference between == and .equals() ?

998

For More Un-Answered { Core Java } Questions Click Here